Passive residual heat exhausting system of pressurized water reactor nuclear power plant

Abstract

The invention provides a passive residual heat exhausting system of a pressurized water reactor nuclear power plant. The passive residual heat exhausting system comprises a passive residual heat removal system and a passive emergency water tank cooling system, wherein the passive residual heat removal system comprises a steam pipe, a passive residual heat exhausting heat exchanger and a condensed water pipe; the passive residual heat exhausting heat exchanger is positioned at the lower part of an emergency cooling water tank of the passive residual heat removal system; the passive emergency water tank cooling system comprises the emergency cooling water tank, a cooling coiled pipe, an ascending pipe, an air cooling heat exchanger and a descending pipe; the cooling coiled pipe is located at the upper part of the emergency cooling water tank. When residual heat removal needs to be carried out under an accident condition or normal shutdown, decay heat of a reactor core is removed by condensing steam at a secondary side so that the safety of a reactor is guaranteed and the possibility of releasing radioactive substances to the environment is reduced. The emergency cooling water tank is used as middle buffering equipment so as to meet the requirements of rapid cooling at the initial stage of an accident and long-time cooling at the later period of the accident.

Description

technical field [0001] The invention relates to a safety system of a nuclear power plant, in particular to a passive residual heat discharge system of a pressurized water reactor nuclear power plant. Background technique [0002] After the shutdown of the nuclear reactor, there will still be a large amount of decay heat generated. This part of the decay heat needs to be discharged to the final heat sink by using a special waste heat removal system for a long period of time, so as to avoid the internal temperature and pressure of the pressure vessel due to heat accumulation. The pressure is too high to destroy the integrity of the pressure boundary. Modern nuclear power plants use a large number of active equipment to realize the function of waste heat discharge. However, the reliable operation of these equipment requires an external stable power source. Once the system fails or there is a serious accident of power outage in the whole plant, the active equipment will not work...

AI Technical Summary

Problems solved by technology

Most of the existing passive waste heat removal systems realize the function of waste heat discharge by directly cooling the primary circuit coolant, such as AP1000. This waste heat discharge method has obvious heat exchange effect, but the requirements for heat exchanger design are relatively high, increasing Probability of Leakage of Radioactive Coolant in Primary Circuit

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